Remove import of re submodule from typing

[caufieldjh]

See linkml/linkml#2420

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.43%. Comparing base (1b5e9f7) to head (caeb9f9).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #349   +/-   ##
=======================================
  Coverage   63.43%   63.43%           
=======================================
  Files          63       63           
  Lines        8982     8982           
  Branches     2574     2574           
=======================================
  Hits         5698     5698           
  Misses       2665     2665           
  Partials      619      619           

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[caufieldjh]

oh, this is redundant vs. #345, and that does a much more thorough job of updating for 3.13